Acquia Cookie Vary is an off the shelf integration with the Acquia platform's Varnish infrastructure that allows for server-side variation on specific cookie values as documented by https://docs.acquia.com/acquia-cloud-platform/docs/performance/varnish/c....

Why server-side cache variation?

Unlike the typical javascript driven segmentation and personalization techniques that are commonly found on the web, server-side solutions offer extreme performance and user experience benefits.

Flashes of original or unstyled content are completely eliminated.
Content layout shifting is completely eliminated.
Pages arrive 100% intact served by a full page caching layer.

Post-Installation

This module simply adds the appropriate Vary headers based on the cache contexts that are present on a page. For example, if the following cache contexts are present on a given page: cookies:acquia_a, cookies:acquia_b, cookies:acquia_c, then this module adds Vary values for X-Acquia-Cookie-A, X-Acquia-Cookie-B, X-Acquia-Cookie-C.

Optional end-user named cookie

The Acquia platform supports a single end-user named cookie. This module provides a settings form that allows a site owner to configure the cookie name. Configuring such a value and providing an appropriate cache context will result in the response varying on X-Acquia-Cookie-Key and X-Acquia-Cookie-Value.

Debugging

Because caching is hard, an optional debug mode setting is provided. Setting debug mode will add custom response headers with their corresponding cookie values. For example, a request with a cookie acquia_a=test to a page that has a cache context of cookies:acquia_a with debug mode enabled will result in a custom response header of X-Acquia-Cookie-A: test being added.

Additional Requirements

If your project is hosted behind a CDN like Cloudflare, additional steps are required:

Acquia Cookie Vary

Issues

Response subscriber runs after finish subscriberActiveCode Created about 1 month ago

Response subscriber runs after finish subscriber
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Created about 1 month ago